Design of filter-based controllers for cross-directional control of paper machines

Due to the limited programming capabilities of some existing cross directional (CD) control platforms, direct implementation of advanced CD control methods is often not possible. This paper presents a tractable method by which the behaviour of an advanced CD control design can be incorporated into a finite impulse response filter. The filter weights are determined using semidefinite programming. Measures of the performance degradation due to the filter approximation are investigated, and the proposed methods are illustrated with a case study